Arc welding electrode



July 3, 1934. w 5 MlLLER 1,965,555

ARC WELDING ELECTRODE Filed Feb. 23, 1933 Con/777 (on/mks A/bcmy 5/40(/ay Weld/n9 Rod Genera/4v ferrous INVENTOR W/LBEI? 8. Mus/P BY ATTORNEYPatented July 3, 1934 UNITE STATES ARC WELDING ELECTRODE Wilber B.Miller, Flushing, N.

Oxweld Acetylene Company,

West Virginia Y., assignor to a corporation of Applicat'on February 23,1933, Serial No. 658,023

8 Claims.

relates to welding rods and as electrodes in metallicarc welding. Thenovel features of the invention reside especially in the coatingemployed on the rod. The distinguishing feature of this invention is theuse of Albany slip clay in the coating.

An object of the invention is to provide a cheap electrode having asilicate coating which shall have desirable properties as evidenced bythe formation of sound welds. This and other. objects of my inventionwill be evident from the accompanying specification having reference tothe accompanying drawing in which the single figure is a ,view of awelding rod illustrating one em bodiment of my invention, the rod havinga portion of the coating broken away.

I have found that Albany slip clay is a desirable ingredient for weldingrod coatings, especially when the rods are to'be used as electrodes. Itis especially advantageous because of its low melting point. Itfurnishes the necessary silica for the formation of silicates which takeup any iron oxide formed during the welding operation. Another bany slipclay is that it acts as a colloid and tends to prevent the settling ofthe slurry during manufacturing'operations. It has been proposed to useclay in a coating for welding rods in the past. For example the patentto Lloyd and- Hill 1,599,056, patented September 7, 1926, proposes theuse of china clay and fire clay. The paten to Languepin 1,302,386,patented April 29, 1919, proposes the use of kaolin. However these clayshavehigh fusing than Albany slip taining the desirable results provedelectrode.

Albany slip clay is a well curable clay fusing at about has been used inthe past for glazing stoneware and for a fused bond in grinding wheels.A typical analysis by the Ohio Geologic Survey is as clay in fluxmixtures in obproduced by my imknown, easily pro- 1230 to 1250 C. I Itfollows:

. Per cent Silica 55.60 Alumina 14.80 Ferric oxide 5.80 Calcium oxide5.70 Magnesium oxide -1 2.48 Potassium oxide 3.23 Sodium oxide 1.0T!Manganese oxide 0.14 Phosphorus pentoxide 0.15 Water -1 5.18

Carbon dioxide plus moisture r Various combinations may be used inemploying Albany slip clay as a coating. The following t by adding onepart of water to 1 compositions have been found to work satisfactorilyon various types of ferrous electrodes:

Feldspar Borax (NazB l01-10H2O) 3.5 to 4 parts by weight. Silica (SiOz)1 part by weight.

These materials are fused to a glass and pulverized.

In using the solution is made above flux mixtures a water-glass bydiluting the commercial syrup to 2 parts of The flux mixture form a thinslurry.

commercial water-glass syrup. is then added to an amount to The baresteel electrodes are then dipped in the slurry and dried. The slip clayis present in an amount greater material and generally in an amountgreater than the sum of all other materials. On account of its colloidalproperties the materials remain in a suspended state for a long time.This is very desirable since it eliminates the danger of segregation dueto the settling out of the heavier materials. Without this clay-a thickslurry must be used, or the slurry must be agitated during use in orderto prevent settling.

In making up a typical coating 35 /2 lbs. of mixture-IV was mixed with 7gallons of waterglass. solution containing 1 /2 parts of commercialsyrup to 1 part of water. Electrodes were dipped in this mixture anddried. They had a thin coating that acted as a good are stabilizer andthe electrodes worked well in all welding positions. A weld made in inchthick plate with inch diameter electrodes coated as stated above had atensile strength of 64,500 lbs. per sq. inch and an elongation of 14% inthe free bend test.

While I have given typical examples of mixtures adapted for use inpreparing coatings it should be noted that various compositions may beemployed. For in accordance with the following limits appearsatisfactory:

Parts by weight Albany slip clay Alkaline .earth carbonate Rutile orilmenite Carbon IIIIIIIIIIIIIIIIIIIIIIIIIII Feldspar Various otherchanges may be made within the my invention and I do not desire to be 0any particular composition except as set forth in the following g acoating containing Albany slip clay.

mg a coating consisting g a coating containing ipal constituent,calexample in preparing a rod Formula IV above 4. A welding rod having acoating comprising Albany slip clay as the principal constituent, analkaline earth carbonate, a titanium ore, carbon and a binder.

5. A welding rod having a coating comprising Albany slip clay 50 to 75parts, alkaline earth carbonate 10 to parts, titanium ore 1 to 20 parts,dextrin 1 to 10 parts, carbon 1 to 10 parts and a binder. v

6. "A ferrous welding rod having a coating com prising Albany slip clayto '75 parts, alkaline earth carbonate 10 to 45 parts, titanium ore 1 to20 parts, dextrin 1 to 10 parts, carbon 1 to 10 parts, feldspar 1 to 20parts and a binder.

7. A ferrous welding rod having a coating comprising Albany slip claysubstantially parts, calcium carbonate substantially 25 parts, dextrinsubstantially 10 parts, rutile substantially 10 parts, carbonsubstantially 5 parts and a water glass binder.

8. A welding rod having a coating containing from about 40 to about byweight of Albany slip clay.

WILBER B. MILLER.

